ABSTRACT : This paper reconstructs the theory of dynamic rationality sketched by Michael Bratman in Intention, Plans, and Practical Reason. Evaluating agent's rationality is not just a matter of evaluating the agent's reasons for acting at the moment of a decision. We must ask not only whether it was rational of the agent to form a future-directed intention, but also whether it is rational of the agent to revise or retain that intention when the moment of action arrives. Such judgements are internal to the framework of the agent's ongoing plans, intentions, and the deliberative processes upstream of every decision. Yet they are also external because they refer to unintentional behavior and conditions beyond the agent's purposive control, such as habits and dispositions. I describe the dilemma Bratmans theory attempts to resolve, present Bratmans normative principles, and identify some outstanding problems. I propose a revision of one of Bratmans principles, arguing for a counterfactual evaluation of non-intentional factors as opposed to his consequentialist approach based on the long-term benefits of the agent's habits.